Doherty C, Bleakley C, Hertel J, Caulfield B, Ryan J, Delahunt E
School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland.
Sport and Exercise Sciences Research Institute, Ulster Sports Academy, University of Ulster, Newtownabbey, Co. Antrim, Northern Ireland.
Scand J Med Sci Sports. 2015 Aug;25(4):525-33. doi: 10.1111/sms.12282. Epub 2014 Jun 27.
No research currently exists investigating the effect of acute injury on single-limb landing strategies. The aim of the current study was to analyze the coordination strategies of participants in the acute phase of lateral ankle sprain (LAS) injury. Thirty-seven participants with acute, first-time LAS and 19 uninjured participants completed a single-leg drop landing task on both limbs. Three-dimensional kinematic (angular displacement) and sagittal plane kinetic (moment-of-force) data were acquired for the joints of the lower extremity from 200 ms pre-initial contact (IC) to 200 ms post-IC. The peak magnitude of the vertical component of the ground reaction force (GRF) was also computed. Injured participants displayed a bilateral increase in hip flexion, with altered transverse plane kinematic profiles at the knee and ankle for both limbs (P < 0.05). This coincided with a reduction in the net-supporting flexor moment of the lower extremity (P < 0.05) and magnitude of the peak vertical GRF for the injured limb (21.82 ± 2.44 N/kg vs 24.09 ± 2.77 N/kg; P = 0.013) in injured participants compared to control participants. These results demonstrate that compensatory movement strategies are utilized by participants with acute LAS to successfully reduce the impact forces of landing.
目前尚无研究调查急性损伤对单腿着地策略的影响。本研究的目的是分析外侧踝关节扭伤（LAS）急性期参与者的协调策略。37名首次发生急性LAS的参与者和19名未受伤的参与者完成了双下肢单腿下落着地任务。从初始接触（IC）前200毫秒到IC后200毫秒采集下肢关节的三维运动学（角位移）和矢状面动力学（力矩）数据。还计算了地面反作用力（GRF）垂直分量的峰值大小。受伤参与者双侧髋关节屈曲增加，双下肢膝关节和踝关节的横断面运动学特征改变（P<0.05）。这与下肢净支撑屈肌力矩降低（P<0.05）以及受伤参与者受伤肢体的垂直GRF峰值大小降低（21.82±2.44N/kg对24.09±2.77N/kg；P=0.013）相一致。这些结果表明，急性LAS参与者采用了代偿性运动策略来成功降低着地冲击力。
